Furnace.



.P. MOQUIST.

FURNACE.

APPLICATION FILED JUNE 11. I917.

Patented Mar. 4, 1919.

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APPLICATION FILED JUNE 11, I917.

Patented MA, 1919.

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P. MOQUIST.

FURNACE.

APPLICATION FILED JUNE ll, t9l7.

1,296,366. Patentad Mar. 4,1919.

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- ing systems, and

PETER MOQUIST, "or MINNEAPOLIS, MINNESOTA.

' FURNACE.

To all whom it may concern:

Be it known that I, PETER MOQUIST, a citizen of the United States, residing at Minneapolis, in the countyof Hennepin'and State of Minnesota, have invented certain new and useful Improvements in Furnaces and I 'do hereby declare the following'to be a full, clear, and exact description of themvent-ion, such as will enable others skilled in the art to which it appertains tomake and use the same. 1 f

My invention relates tofu'rnaces-for'h'eathas for its object'to increase the efficiency thereof and, at the same time, save fuel; and, to this end, it consists of the novel devices and combinations of devices hereinafterdescribed and defined in the claims. 7

. 'In the accompanying drawings, which illustrate the invention, like characters indicate like parts'throughout the several views.

Referring to the drawings, 1

'Figure' l-is a front elevation-of the improved furnace;

Fig. 2 is a plan view pf-the same with some parts broken away and with some of the exposed parts sectioned;

Fig. 3'is'a view principally in longitudi- 'nal vertical section takenon the line '3-3 of Fig. 2'; g

Fig. l is a View partly in'elevationand partly in longitudinal vertical section taken through-the furnace of'the boiler;

Fig. 5 is a transverse vertical section taken 0n the irregular line 5-5 of Fig. 2; and

Fig. 6 is a transverse "vertical section 'taken on theirregularline 6+6 of Fig. 2.

The numerals- 7 and 8 indicate, respec- "tively, a 'fire-box' housing and a boiler housin'g laterally space'd,the'one from the other,

and connected-at their rear ends by a "secondary combustion chamber '9. As shown,

"the housings? and 8 and secondary combusp -dicated by the numeral 82.

tion chamber 9 are all constructed of masonry, except the'front ends of said housings,-which are closed by cast metal ends 10 and ll, respectively. In'the front' end of 'the fire-box housing is a primary combustion chamber '12, having thereina grate 13 under which is an I ash-pit '14. The front end 10 of the-fire-box housing 7 is provided with double fueldoors 1,5 and double ash doors 16. r

Extending rearward from combustion "chamber 12 w the secondary combustion a smoke-stack 27.

Specification of Letters Patent. Patented Mar, 4 1919, Application filed June 11, 1917, Serial No. 173,946. I

chamber 9, are a plurality of horizontal main flues '17 that are spaced both vertically and horizontally and are supported on has communication through a multiplicity of secondary flues 20, preferably of .the

"same form andconstruction as themain flues 17. These secondary flues 20 are supported on masonry '21, withthe uppermost there of in direct contact with a horizontal boiler 22-having upper andlower flues 23 and 24:

and supported from. the sidewalls'of the boiler housing 8. The lower boilerfl'ues 24 connect=the tertiarychamber 19 with a return chamber 25, at the rear end of the boiler 22, are supported upon the primary combustion chamber 9, as shown, and constructed of sheet metal. The upperboiler flues 23 connect the return chamber 25 to a smoke-stack chamber* 26 from which leads The smoke-stack chamber 26 is located directly over the tertiary combustion chamber 19 and is separated therefrom"-by a horizontal 'metal partition 28.1 Access may g bustion chamber" 19: through double doors "29 Iformedin the front'end 11 of the boiler "housing 8, and access may be had to the smoke-stack chamber 26 through double doors 30, also formed in said front end 11.

be had to the tertiary com- Extending through. the top of the fire-box housing 7 ,and'opening into thefire-boX 1 2, -=i's a fuel feed hopper 31. The return water ipe to the boiler 22frornthe system'is in- Fresh air is supplied to the fire "from under the grate 1'3 througha conduit 33, in

thetop'ofthe fire box'housing-'7 down fines 34,;jreturnfiues3'5, air chamber 36, and a multiplicity'of winding air ports 37. As shown; the fresh air conduit 33 is formed'by providing the top of the fire-boxh'ousing water in the boiler '22.

entering the return chamber 25, willpass a is;

opening 38 in the upper wall of the top of the fire-box housing 7 and at the rear of the main flues 17.

The down air flues 35 are formed in the side walls of the fire-box housing 7 and afford communication between the forward end portion of the air conduit 33, with the corresponding end portions of the return air flues 35 also formed. in said side walls. The air chamber 36 extends transversely through the bridge wall 18 and affords a .branch ports 40 is controlled by dampers 41.

The flames from the primary combustion I chamber 12, passing through the flues 17 to the secondary combustion chamber 9, keep the same red-hot, so that all combustible matter therein continues to burn. The products of. combustion in the secondary combustion chamber 9 will, of course, expand, but, upon entering the return flues 20, will not travel any faster than while traveling through the fiues 17, for the reason that the aggregate transverse area of the fiues 20 over that of the flues 17 is materially increased by providing a greater number of flues 20. As the flues 20, like thefiues 17, are red-hot, all unburned combustible matter, while passing therethrough and through the tertiary combustion chamber 19, will be consumed and, upon entering the lower boiler flues 24, will produce their greatest effect upon the From the. lower boiler flues 24, the products of combustion,

to the smoke-stack chamber 26, through the upper boiler flues 23, again subjecting the -water in the boiler 22to their heat. From the above description, it is evident that all combustible matter leaving the primary combustion chamber 12 is continuously subjected to the red-hot walls of the flues 17 and20 and combustion chambers 9 and 19, so that the same is entirely consumed before reaching the boiler 22. By making the flues 17 and 20 oval shaped in cross section, the sides of adjacent flues are brought close together,

so that they will heat quickly, -andf their strength is increased to support the load thereon. 1 V

Fresh air,passing through the conduit 33 the primary delivered under the fire on the grate 13 and into the secondary combustion chamber 9.

By adjusting the dampers 39 and 41, the 'desired amount of fresh air may be delivered under the fire and into the secondary combustion chamber 9.

What I claim is 1. A furnace having primary, secondary and tertiary combustion chambers, main flues connecting the primary and secondary combustion chambers, secondary flues connecting the secondary and tertiary combustion chambers, anda boiler having flues in communication withthe tertiary combustion chamber. r V v 2. A furnace having primary, secondary and tertiary combustion chambers, main flues connecting the. primary and secondary combustion chambers, secondary flues connecting the secondary and tertiary combus tion chambers, and a boiler having flues in communication with the tertiarycombustion chamber, said main and secondary fiues being made from baked fire clay.

V 3'. A furnacehaving primary, secondary. and tertiary combustion chambers, main fiues connecting the primary and secondary combustion chambers, secondary flues connecting the secondary and tertiary combustion chambers, and a boiler having flues in communication with the tertiary combustion chamber, said main and secondary flues being made from baked'fire clay and each having a cross section'that is in the form. of an uprightroval. J I

4:. A furnace having primary, secondary and tertiary combustion chambers, main .flues connecting the primary and secondary combustion chambers, secondary flues connecting the secondary and tertiary combus-, tion chambers, and a boiler having flues in communication with the tertiary combustion chamber, said secondary flues having a greater area in cross section than said main flues. r

5. A furnace having primary and secondary combustion chambers, mam flues connecting the primary and secondary combustion chambers, a tertiary combustion chamber, secondary fiues connecting the secondary and tertiary combustion chambers,.a 'boiler having'upper and lower fiues, a return chamber, and a'smoke-stack chamber, said lower boller flues connectingthe tertiary combustion chamber and return chamber jan'd'saidj upper fiues connecting the returnchamber v and the smoke-stack chamber. 7 V 7 6. A furnace having in its front end primary and tertiary combustion chambers, lat- 12 5 erally spaced onefrom'theothena secondary combustion chamber at the;rea end of the furnace,a return chamber over the secondary, ,combustio1rchamber, a smoke-stack chamber over'the tertiary combustion cham' ',ber,.main flues connecting the primary and 13o if secondary combustion chambers, secondary fiues connecting the secondary and tertiary combustion chambers, and a boiler located over the secondary flues and having upper and lower flues, said lower flues connecting the tertiary combustion chamber and return chamber and said upper boiler flues connecting the return chamber and smoke-stack chamber.

7. A furnace having a fire-box housing and a boiler housing, laterally spaced one from the other, a secondary combustion chamber connecting the rear ends of said two housings, a primary combustion chamber in the front end of the fire-box housing, main flues connecting the primary and secondary combustion chambers, a tertiary combustion chamber in the front end of the boiler housing, secondary flues connecting Copies of this patent may be obtained for five secondary and tertiary combustion chambers, a boiler in the boiler housing supported over the secondary flues and having upper and lower flues, a smoke-stack chamber located in the boiler housing over the tertiary combustion chamber, and a return chamber located over the secondary combustion chamber, the lower flues of said boiler connecting the tertiary combustion chamber and the return chamber and the upper fiues of said boiler connecting the return chamber with the smoke-stack chamber.

In testimony whereof I affix my signature in presence of two witnesses.

PETER MOQUIS-T.

Witnesses:

CLARA DEMAREST, HARRY D. KILGORE.

cents each, by addressing the "Commissioner of Patents,

Washington, D. 0. 

